Metal-shears.



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UNITED STTES PATENT JAMES C. BURGESS, OF SHERIDAN, INDIANA, ASSIGNOR TO VILLIAM A.

SCOTT, OF SHERIDAN, INDIANA.

M ETAL-SHEARS.

SPECIFICATION forming part of Letters Patent No. 685,096, dated October 22, 1901.

Application filed June 20, 1901.

To LZZ whom it may concern:

Be it known that I, JAMES C. BUReEsaa citizen of the United States, residing at Sheridan, in the county of Hamilton and State'of Indiana, have invented Vcertain new and useful Improvements in Metal-Shears; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of `reference marked thereon, which form a part of this specification.

This invention has reference to hand-power shears for cutting bar and sheet metals, the object of the invention being to provide shears that may be quickly adj usted, so that a thick bar may be cut nearly as easily as a thin bar, which may be particularly suitable for use in jobbing-smith shops.

The invention consists in a shear or cutting blade having a movable pivotal support, whereby the blade may be adjusted with relation to an opposing fixed blade; and it consists also in the parts and in the combination and arrangement of parts hereinafter particularly described ,andjclaimed Referring to the drawings, in which similar reference characters designate corresponding parts, Figure l represents a side elevation of a shearingtool constructed in accordance with my invention and showing the movable shear-blade adjusted in a suitable position to cut a thick bar or plate of metal; Fig. 2, a side elevation thereof, showing the movable shear-blade adj usted for cutting a thin piece 0f metal, also showing the operating-lever connected to the movable blade; Fig. 3, a side elevation showing the movable blade in contact with the fixed blade, as when a cut has been made; and Fig. 4 is a vertical transverse sectional view taken through the center of the movable pivot of the movable bladejaw, showing the means whereby said blade is adjusted and its pivot temporarily fixed, and also showing false table-tops for supporting one end of the bar or plate of metal while being adjusted for cutting.

In construction I provide a suitable main frame d, having a base b, to both of which is Serial No, 65,254. (No model.)

connected an arm c, the main frame having an upper fixed jaw, to which is secured a fixed shear-blade d. A vertically-movable pivot-bar e is suitably connected with the main frame a. aud carries a pivot-boltf, on which is mounted one end of a lower movable jaw g, this jaw having the movable shearblade h secured thereto. A lever c', mounted on a rotating bearing lo, is connected to the forward or free end of the jaw g by a pivotpin p. The bearing lc is mounted on an axle Z, secured to the arm c of the frame d, A removable portion of the arm c has a curved slot ln, in which a guide-bolt j works, said bolt extending through the fulcrum end of the lever c' and preferably having a retaining-nut fm. The fulcrum end of the lever 'L' and also the bearing k are provided with meshing teeth o, so that when the lever is operated the bearing is caused to move rotatively on its axle, thereby lessening the frictional resistance to the minimum degree. A lever r, having teeth t, is pivoted near one end thereof to the main frame d, and it has its shorter end u in engagement in a recess c with the bar e, whereby the bar e and the rear end of the jaw g may be moved verticallyat will, a pawl s, pivoted also to the main frame, having its free end adapted to engage the teeth t, whereby to latch the lever fr', the weight of the bar c causing the pawl to remain in contact in the position in which the lever r may be placed. At the opposite side of the frame a is a table y, having false tops w fw', arranged thereon to slide longitudinally of the blade d at the side thereof 0pposite the blade h, the tops having each a suitable slot, in which is a bolt screwed into the table y, so that when either of the tops is brought into use all of them may be rigidly secured to the table to prevent dislodgment thereof.

In practical use for cutting thin metal the jaw g is adjusted as indicated in Figs. 2 and 3, the rear ends of the cutting-blades when open being close together, and for cutting thick metal the jaw g is to be adjusted as in Fig. 1, the rear ends of the blades being then less close together, permitting the insertion of a thicker piece of metal between the blades near the pivot of the lower jaw, thus IOO having as much leverage in cutting the thicker metal as when cutting thin metal, which will be found in practice to be a great advantage. When cutting thin metal, the top w, or both the tops 'w and w', may be moved forward, upon which to rest the metal, and obviously they may be withdrawn when cutting thick metal, using the top proper of the table fora support.

The operation of the machine is as follows: Supposing that a bar of iron as thick as the machine is designed to cut is to be out 0E into shorter lengths, the pawl s is to be lifted and the outer end of the lever r raised, causing the bar e to descend and with it the pivoted end of the jaw g, so that the barl of iron may be inserted between the shear-blades as close as may be to the pivot ofthe movable jaw, where the leverage is greatest, it being understood that the free end of the jawg has a limited travel and that it has been depressed before inserting the iron to be cut. These positions are shown in Fig. 1. Now if the lever t' be forced down, as usual, the bar may be cut with much less eort than in shears in which the thicker iron must be .placed near the free end of the movable jaw in order to enter it between the blades. Should the opening between the shear-blades be too great, the lever-jaw may be quickly adj usted by pressing down on the lever r until the desired adjustment is secured, when the pawl S, dropping into engagement with the tooth t, will retain the parts in the proper position. Further adjustment forcutting thinner metal may be made in the same manner. In moving the lever 2'. the teeth o will cause the bearing k to rotate, and theaxle thereof being comparatively small will oier little resistance to the movement of the lever t'. To operate the false tops w w', the bolt is to be loosened, when the tops may be moved longitudinally on the table y to their proper positions for use and the bolt again tightened, so as to bind the tops.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. Ashearing-toolineludingaframe,atixed shearing jaw, a movable bar adj ustably mounted in the frame, a movable shearingjaw pivoted to the movable bar, a lever engaging the movable bar for operating the same and adjusting the shearing-jaw pivot, and a lever engaging the pivoted jaw.

2. A shearing-tool includingaframe,a fixed shearing jaw, a vertically adjustable bar mounted in the frame, an adj ustinglever engaging the bar, teeth upon the lever, a pawl pivoted in range of said teeth, a movable shearing-jaw pivoted to said bar, and an operating-lever pivoted to the said movable shearing-j aw.

3. In a shearing-tool, the combination with the main frame having the fixed shear-blade, of an adjustable bar, a pivoted bolt supported by said bar, a movable shearing-jaw mounted on said bolt, means whereby to adjust and secure said adjustable bar whereby said movable jaw may be adj usted relatively to said fixed shear-blade, and an operating-lever engaging the free end of said movable jaw.

4. In a shearing-tool, the combination with the main frame having the fixed shear-blade, of the movable bar mounted on the frame, the lever engagingsaid bar and having teeth thereon, the pivoted pawl adapted to engage said teeth, the pivot-bolt supported by said bar, the movable jaw mounted on said pivot, the shear-blade secured to said jaw, the operating-lever pivoted to said jaw,the teeth at the fulcrum end of said operating-lever, the journaled bearing for said operating-lever, and the teeth on said bearing engaging the teeth on said lever.

5. ln a shearing-tool, the combination with the main frame having the fixed shear-blade, of the movable bar mounted on the main frame, the lever engaging said bar and having teeth thereon, the pivoted pawl engaging said teeth, the pivot-bolt supported by said bar, the movable jaw mounted on said pivotbolt, the shear-blade secured to said jaw, the operating-lever for said jaw, and the journaled bearing for said operating-lever.

6. In a shearing-tool, the combination with the main frame having the table and the stationary shear-blade, of the movable shearblade having the movable pivotal support, the operating-lever, the sliding false tops upon said table having slots therein, and the securing-bolt extending through said slots and into said table.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES C. BURGESS.

Vit-nesses:

A. C. DE ACYRUS, E. M. LANE.

IOO 

